New autoconf tests - let's try this again

[Bruce Korb]

Zack Weinberg wrote:
> 
> The previous generation of this test script got a bunch of spurious
> failures (code 7) because it didn't try hard enough to get two
> consecutive maps allocated next to each other.

   Have mmap from /dev/zero.
   No mmap with MAP_ANON(YMOUS).
   mmap of /dev/zero works.
   -rw-r--r--   1 bkorb    dev           22 Jan  9 10:21 test1a.l
   -rw-r--r--   1 bkorb    dev            0 Jan  9 10:20 test1z.l
   -rw-r--r--   1 bkorb    dev            0 Jan  9 10:21 test2z.l
   SCO_SV ellen 3.2 5.0.5 i386 unknown

   $ cat test1a.l
   mmap: Bad file number

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